topic Great circle tracks in ArcGIS Mapping and Charting Questions https://community.esri.com/t5/arcgis-mapping-and-charting-questions/great-circle-tracks/m-p/746629#M2639 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>I am Xojo developer, working on navigation software application.<BR />my application concern geodetic science, on oblate and spherical earth.<BR />my question is really very small detail about great circle tracks.<BR />Everything is working properly, i am trying to resolve the problem of longitudes Way points.<BR />So, when for e g, longitude of departure is 013°25' W and arrival is 075°W, west bounding , with longitude difference between Way points "DLo", is 5°.</P><P>My program compute legs from 013° 25'W each 5°, it means that the next wp longitude will be 018°25'W, etc ...<BR />I am looking for solution to convert the first wp to integer value multiple of "Dlo"=5°, thus next must be 015 00W , 020 00W , 025 00W, etc.<BR />Whit this way, its more easy for the user to plot the way points and the path on a plotting sheet with integer values of longitude. </P><P><BR />This image is the longitudes wp output that i want to do:</P><P><IMG alt="GCT.PNG" class="image-1 jive-image" src="https://community.esri.com/legacyfs/online/156147_GCT.PNG" style="height: auto;" /></P></BODY></HTML> Mon, 14 Dec 2015 17:19:15 GMT DjamelAIT_AMRANE 2015-12-14T17:19:15Z Great circle tracks https://community.esri.com/t5/arcgis-mapping-and-charting-questions/great-circle-tracks/m-p/746629#M2639 <HTML><HEAD></HEAD><BODY><P>Hello,</P><P>I am Xojo developer, working on navigation software application.<BR />my application concern geodetic science, on oblate and spherical earth.<BR />my question is really very small detail about great circle tracks.<BR />Everything is working properly, i am trying to resolve the problem of longitudes Way points.<BR />So, when for e g, longitude of departure is 013°25' W and arrival is 075°W, west bounding , with longitude difference between Way points "DLo", is 5°.</P><P>My program compute legs from 013° 25'W each 5°, it means that the next wp longitude will be 018°25'W, etc ...<BR />I am looking for solution to convert the first wp to integer value multiple of "Dlo"=5°, thus next must be 015 00W , 020 00W , 025 00W, etc.<BR />Whit this way, its more easy for the user to plot the way points and the path on a plotting sheet with integer values of longitude. </P><P><BR />This image is the longitudes wp output that i want to do:</P><P><IMG alt="GCT.PNG" class="image-1 jive-image" src="https://community.esri.com/legacyfs/online/156147_GCT.PNG" style="height: auto;" /></P></BODY></HTML> Mon, 14 Dec 2015 17:19:15 GMT https://community.esri.com/t5/arcgis-mapping-and-charting-questions/great-circle-tracks/m-p/746629#M2639 DjamelAIT_AMRANE 2015-12-14T17:19:15Z Re: Great circle tracks https://community.esri.com/t5/arcgis-mapping-and-charting-questions/great-circle-tracks/m-p/746630#M2640 <HTML><HEAD></HEAD><BODY><P>Why not round the input value (internally) to the nearest 5 degrees, then calculate the way points?</P></BODY></HTML> Tue, 29 Dec 2015 22:27:24 GMT https://community.esri.com/t5/arcgis-mapping-and-charting-questions/great-circle-tracks/m-p/746630#M2640 MelitaKennedy 2015-12-29T22:27:24Z